This part is a kind of semiconductor called BC517.

Function of this product has Darlington Transistors.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Darlington Transistors NPN Silicon Order this document by BC517/D BC517 COLLECTOR 1 BASE 2 EMITTER 3 MAXIMUM RATINGS Rating Symbol Value Unit Collector – Emitter Voltage Collector – Base Voltage Emitter – Base Voltage Collector Current Continuous Total Power Dissipation @ TA = 25°C Derate above 25°C VCES VCB VEB IC PD 30 Vdc 40 Vdc 10 Vdc 1.0 Adc 625 mW 12 mW/°C Total Power Dissipation @ TC = 25°C Derate above 25°C PD 1.5 Watts 12 mW/°C Operating and Storage Junction Temperature Range TJ, Tstg – 55 to +150 °C THERMAL CHARACTERISTICS Characteristic Symbol Max Unit Thermal Resistance, Junction to Ambient RqJA 200 °C/W Thermal Resistance, Junction to Case RqJC 83.3 °C/W ELECTRICAL CHARACTERISTICS (TA = 25 [ ... ]

BC517 PDF Datasheet Download